Purification Equipment

Abstract

To alleviate the influence of thermal stress.SOLUTION: A purifier is configured to purify an exhaust gas of a vehicle, and comprises a case part, first and second connection parts and an absorption part. The case part accommodates at least one purification member configured to purify exhaust gas. The first and second connection parts are arranged at opposite sides of the case part, and are connected to other members that form a flow passage of the exhaust gas of the vehicle. The absorption part adjoins the flow passage of the exhaust gas in the case part, is arranged in the case part so as to move around the flow passage, and is configured to absorb elongation and contraction of the case part along a flow direction of the exhaust gas.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a purification device. [Background technology]

[0002] In an exhaust gas purification device having a so-called tandem structure, exhaust gas purification members such as a catalyst and a GPF (Gasoline Particulate Filter) are arranged in series along the flow direction of the exhaust gas.

[0003] As an example, the exhaust gas purification device of Patent Document 1 has two catalysts arranged in series inside a case having a double-tube structure, and the outer tube of the case is formed with a bellows portion that expands and contracts in the length direction of the outer tube. When a difference occurs in the amount of thermal expansion between the inner tube and the outer tube, the bellows portion expands and contracts to relieve the stress on the connection portion connecting the inner tube and the outer tube. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-85138 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the exhaust gas purification device of Patent Document 1, the periphery of both ends of the inner pipe of the case having a double pipe structure is tapered toward the ends, and the inner pipe is fixed to the exhaust pipe by flanges provided at both ends. Therefore, when thermal expansion occurs in the inner pipe, stress is applied to the periphery of the flanges at both ends of the inner pipe, and it is difficult for the bellows portion provided in the outer pipe to relieve such stress.

[0006] In one aspect of the present disclosure, it is desirable to mitigate the effects of thermal stress. [Means for solving the problem]

[0007] One aspect of the present disclosure is a purification device mounted on a vehicle and configured to purify exhaust gas from the vehicle, comprising a case portion, first and second connection portions, and an absorption portion. The case portion is a cylindrical portion in which an exhaust gas flow path is provided, and is a portion that houses at least one purification member configured to purify the exhaust gas. The first and second connection portions are provided at both ends of the case portion and configured to be connected to other members that form the exhaust gas flow path of the vehicle. The absorption portion is provided in the case portion adjacent to the exhaust gas flow path inside the case portion and circumnavigates the flow path. In addition, the absorption portion is configured to absorb expansion and contraction of the case portion along the flow direction of the exhaust gas.

[0008] According to the above configuration, even if the first and second connection parts at both ends of the case part are connected to other members, the absorbing part can absorb the thermal expansion of the case part due to exhaust gas and the contraction of the case part due to cooling, thereby mitigating the effects of thermal stress.

[0009] In one aspect of the present disclosure, the case may have first and second winding parts that wind around the exhaust gas flow path inside the case. The second winding part may be disposed outside the first winding part. The absorption part may be a part that is provided between the first winding part and the second winding part and has a curved shape that protrudes toward the upstream side or downstream side in the exhaust gas flow direction in a cross section that includes an axis that passes through the center of the exhaust gas flow path inside the case.

[0010] According to the above-described configuration, the absorbing portion is able to flex and thus absorb the thermal expansion and contraction of the case portion, thereby reducing the effects of thermal stress. In one aspect of the present disclosure, the case portion may have first and second case portions that are cylindrical portions arranged side by side in the flow direction of the exhaust gas. The first and second case portions may house first and second purification members that are purification members, respectively. The first case portion may have a first opening and a first circulating portion. The first opening is located at an end portion. The first circulating portion circulates around the first opening. The second case portion may have a second opening and a second circulating portion. The second opening is located at an end portion. The second circulating portion circulates around the second opening. The first opening of the first case portion may be connected to the second opening of the second case portion. The absorbing portion may be provided between the first circulating portion and the second circulating portion.

[0011] According to the above-mentioned configuration, a configuration for mitigating the effects of thermal stress can be provided in the portion of the case that is likely to be damaged (hereinafter, the weak portion), thereby suppressing damage to the weak portion and thus mitigating the effects of thermal stress.

[0012] In one embodiment of the present disclosure, the second winding portion may be disposed outside the first winding portion, and at least a portion of the second winding portion may face the first winding portion. The absorbing portion may be provided in portions of the first winding portion and the second winding portion that face each other.

[0013] According to the above-described configuration, since a configuration for mitigating the effects of thermal stress can be provided at the weak portion of the case, damage to the weak portion can be suppressed, and therefore the effects of thermal stress can be mitigated. In one aspect of the present disclosure, a sensor hole that communicates between the outside of the case and the space between the first and second purification members may be provided in a portion of the second winding part facing the first winding part and / or in the absorption part. The sensor hole may be configured to be connected to a sensor pipe provided with a sensor that measures the pressure of the exhaust gas.

[0014] According to the above-mentioned configuration, collision of exhaust gas with the sensor hole can be mitigated, and therefore, a decrease in the measurement accuracy of the exhaust gas pressure by the sensor caused by the exhaust gas flow can be suppressed. [Brief description of the drawings]

[0015] [Figure 1] FIG. [Diagram 2] 3 is a cross-sectional view including an axis of the upstream and downstream case portions, the upstream and downstream purification members, and the absorption portion. FIG. [Diagram 3] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Figure 4] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Diagram 5] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Figure 6] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Figure 7] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Figure 8] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Figure 9] 13 is a cross-sectional view including an axis of upstream and downstream winding portions and an absorbing portion of a modified example. FIG. [Figure 10] 13 is a cross-sectional view including an axis of the upstream and downstream winding portions, the absorbing portion, and the sensor hole portion of a modified example. FIG. [Figure 11] 13 is a cross-sectional view including an axis of the upstream and downstream winding portions, the absorbing portion, and the sensor hole portion of a modified example. FIG. [Figure 12] 13 is a cross-sectional view including an axis of the upstream and downstream winding portions, the absorbing portion, and the sensor hole portion of a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the following embodiments, and various forms may be adopted as long as they fall within the technical scope of the present disclosure.

[0017] [1. Overview] The purification device 1 of this embodiment is mounted on a vehicle and constitutes a part of the flow path of exhaust gas from the engine of the vehicle (see FIG. 1). The purification device 1 is connected to an exhaust gas outlet of an exhaust manifold (hereinafter, "exhaust manifold") (not shown) that collects the flow paths of exhaust gas from each cylinder of the engine into one, and is configured to purify the exhaust gas as the exhaust gas that has passed through the exhaust manifold flows into the purification device 1. Hereinafter, the upstream side and downstream side in the flow direction of the exhaust gas will be simply referred to as the upstream side and the downstream side, respectively.

[0018] The purification device 1 includes a case section 2, upstream and downstream purification members 30, 40, and an absorption section 5. A sensor pipe 60 extends from approximately the center of the purification device 1 in the flow direction of the exhaust gas, and a pressure sensor 61 is provided at an end of the sensor pipe 60.

[0019] [2. Case] [(1) Connection and cone parts] The upstream connection part 20 is a flange-shaped part provided at the upstream end of the case part 2 (see FIG. 1). The upstream connection part 20 is connected to an exhaust gas outlet of the exhaust manifold, and fixes the case part 2 to the exhaust manifold outlet. Note that the upstream connection part 20 is not limited to the exhaust manifold, and may be connected and fixed to, for example, an exhaust gas outlet of an internal combustion engine of a vehicle, or a pipe through which exhaust gas flows downstream.

[0020] The upstream cone section 22 is a tapered section whose cross section perpendicular to the flow direction of the exhaust gas (hereinafter simply referred to as the cross section) decreases toward the upstream side. The upstream connection section 20 is provided at the upstream end of the upstream cone section 22.

[0021] The downstream connecting part 21 is a flange-shaped part provided at the end of the downstream side in the exhaust gas flow direction (hereinafter simply referred to as the downstream side) of the case part 2. The downstream connecting part 21 is connected to another member that forms a flow path of the exhaust gas, and fixes the case part 2 to the other member.

[0022] The downstream cone section 23 is a tapered section whose cross section decreases toward the downstream side. The downstream connection section 21 is provided at the upstream end of the downstream cone section 23. [(2) Upstream and downstream case sections] The upstream and downstream case parts 3, 4 are cylindrical parts, and an exhaust gas flow path is formed inside (see Figs. 1 and 2). The upstream case part 3 is located upstream of the downstream case part 4, and an opening located at the downstream end of the upstream case part 3 (hereinafter, upstream opening 32) is connected to an opening located at the upstream end of the downstream case part 4 (hereinafter, downstream opening 42). In addition, the opening located at the upstream end of the upstream case part 3 is connected to the upstream cone part 22, and the opening located at the downstream end of the downstream case part 4 is connected to the downstream cone part 23.

[0023] The upstream and downstream case parts 3 and 4 house cylindrical upstream and downstream purification members 30 and 40, respectively, which are configured to purify exhaust gas. The upstream and downstream purification members 30 and 40 are provided with holding members 31 and 41, respectively, which surround the outer circumferential surfaces. In other words, the holding members 31 and 41 are disposed between the upstream purification member 30 and the upstream case part 3, and between the downstream purification member 40 and the downstream case part 4, respectively.

[0024] As an example, the upstream purification member 30 is configured as a catalyst (e.g., a three-way catalyst, etc.), and the downstream purification member 40 is configured as a filter (e.g., a GPF (Gasoline Particulate Filter), etc.) that collects particulate matter in the exhaust gas. As an example, the downstream purification member 40 has a larger cross-sectional diameter than the upstream purification member 30, and accordingly, the cross-sectional diameter of the downstream case portion 4 is also larger than the cross-sectional diameter of the upstream case portion 3. As a result, the downstream case portion 4 has higher rigidity than the upstream case portion 3.

[0025] [3. Absorption section] An absorption unit 5 is provided between the upstream case part 3 and the downstream case part 4 (see FIG. 2). The absorption unit 5 is provided in the upstream and downstream case parts 3 and 4 so as to be adjacent to the exhaust gas flow path inside the upstream and downstream case parts 3 and 4 and to go around the flow path. The absorption unit 5 is configured to absorb expansion and contraction by deforming in response to expansion and contraction of the case part 2 along the exhaust gas flow direction inside the upstream and downstream case parts 3 and 4 (in other words, the direction of the axis A). The axis A is a line passing through the center of the exhaust gas flow path, and as an example, is a straight line passing through the center of the cross section of the upstream and downstream case parts 3 and 4 and extending in the exhaust gas flow direction.

[0026] Here, the portion of the upstream case portion 3 surrounding the upstream opening 32 is referred to as the upstream winding portion 33, and the portion of the downstream case portion 4 surrounding the downstream opening 42 is referred to as the downstream winding portion 43. The downstream winding portion 43 is located outside the upstream winding portion 33, and at least a portion of the downstream winding portion 43 faces the upstream winding portion 33 in the radial direction.

[0027] The absorbing section 5 is provided between the upstream winding section 33 and the downstream winding section 43, and is a plate-like section having a curved shape protruding toward the upstream side in a cross section including the axis A. The curved shape is provided over the entire circumference of the absorbing section 5.

[0028] Specifically, the absorbing section 5 is provided in the portions of the upstream and downstream winding sections 33, 43 that face each other in the radial direction (in other words, the overlapping portions). The absorbing section 5 spreads from the outer circumferential surface of the upstream winding section 33 to the inner circumferential surface of the downstream winding section 43, and closes the gap between the upstream winding section 33 and the downstream winding section 43. In other words, the absorbing section 5 is provided so as to surround the upstream winding section 33. The absorbing section 5 has a U-shaped curved shape at one point so that the radial center protrudes upstream in a cross section including the axis A.

[0029] When expansion and contraction occurs in the upstream case part 3 along the axis A, the absorbing part 5 deforms in response to the expansion and contraction such that the connection part with the upstream case part 3 is displaced upstream or downstream. When expansion and contraction occurs in the downstream case part 4 along the axis A, the absorbing part 5 deforms in response to the expansion and contraction such that the connection part with the downstream case part 4 is displaced upstream or downstream. Therefore, when expansion and contraction occurs along the axis A in both or either of the upstream and downstream case parts 3, 4, the absorbing part 5 deforms to absorb the expansion and contraction.

[0030] In this embodiment, as an example, the absorbing section 5 is formed by deforming the downstream case part 4. That is, first, an end part of the downstream case part 4 surrounding the downstream opening 42 is curved toward the inside of the downstream opening 42. Then, the curved end part is welded to an end part of the upstream winding part 33 surrounding the upstream opening 32, thereby forming the absorbing section 5.

[0031] [4. Sensor hole] A sensor hole 6 penetrating the downstream winding portion 43 is provided in a region extending across a portion of the downstream winding portion 43 radially facing the upstream winding portion 33 and the absorption portion 5 (see FIG. 2). The sensor hole 6 communicates between the outside of the case portion 2 and an intermediate region 10, which is a space between the upstream and downstream purification members 30, 40 in the exhaust gas flow path.

[0032] An end of a sensor pipe 60 is inserted into the sensor hole 6, and the intermediate region 10 communicates with the inside of the sensor pipe 60. A pressure sensor 61 provided in the sensor pipe 60 measures the pressure of the exhaust gas in the intermediate region 10, and based on the measurement result, the degree of clogging of the downstream purification member 40 by the collected particulate matter and the like is detected.

[0033] When the degree of clogging of the downstream purification member 40 detected by the pressure sensor 61 becomes large, a regeneration process is performed to remove the clogging of the downstream purification member 40. Specifically, in the regeneration process, for example, high-temperature exhaust gas may be caused to flow into the case portion 2 to combust the particulate matter captured in the downstream purification member 40.

[0034] [5. Modifications of the absorbing part] The configuration of the absorbent section 5 is not limited to the above-mentioned one, but may be determined as appropriate. Modified examples related to the absorbent section 5 will be described below.

[0035] [(1) Shape of the absorbing part] The absorbing section 5 may have a curved shape so as to protrude downstream in a cross section including the axis A. Specifically, for example, as shown in Fig. 3, the absorbing section 5 may have a shape curved into a U-shape at one point so that the center in the radial direction protrudes downstream in a cross section including the axis A. The absorbing section 5 may be formed, for example, in an arc shape of less than 180 degrees in a cross section including the axis A.

[0036] In addition, the absorbing section 5 may have a U-shaped curved shape at two or three points so as to protrude upstream or downstream in a cross section including the axis A (see Figures 4 to 6), or may have a U-shaped curved shape at four or more points in the cross section.

[0037] In addition, the absorbing section 5 may have a bent shape in a cross section including the axis A so as to protrude toward the upstream side or the downstream side. The absorbing section 5 is provided in portions of the upstream and downstream winding sections 33, 43 that face each other. However, a configuration is also envisaged in which the upstream opening 32 of the upstream case section 3 and the downstream opening 42 of the downstream case section 4 are located on the same plane, and the upstream and downstream winding sections 33, 43 do not face each other in the radial direction. In such a case, the absorbing section 5 may be provided between the end of the upstream winding section 33 and the end of the downstream winding section 43.

[0038] [(2) Method of forming the absorbing part] The absorbing section 5 may be formed by deforming the upstream case part 3 (see FIG. 3). In this case, first, an end part of the upstream case part 3 surrounding the upstream opening 32 is curved outward from the upstream opening 32. Then, the curved end part is welded to an end part of the downstream winding part 43 surrounding the downstream opening 42, thereby forming the absorbing section 5.

[0039] When the absorbent section 5 is bent so as to protrude upstream, it is preferable to form the absorbent section 5 by deforming the downstream case section 4. On the other hand, when the absorbent section 5 is bent so as to protrude downstream, it is preferable to form the absorbent section 5 by deforming the upstream case section 3. However, this is not limiting, and it is possible to determine whether the absorbent section 5 is formed in the upstream or downstream case section 3, 4 as appropriate.

[0040] Also, the absorbing portion 5 may be formed of a separate member from the upstream and downstream case portions 3, 4, and the absorbing portion 5 may be welded to the upstream and downstream winding portions 33, 43 (see Figs. 5 and 6). [(3) Diameter of upstream and downstream case parts] In this embodiment, the cross-sectional diameter of the downstream case part 4 is larger than the cross-sectional diameter of the upstream case part 3. However, depending on the sizes of the upstream and downstream purification members 30 and 40, it is also possible that the cross-sectional diameters of the upstream and downstream case parts 3 and 4 are approximately the same, or that the cross-sectional diameter of the upstream case part 3 is larger than the cross-sectional diameter of the downstream case part 4.

[0041] When the cross-sectional diameter of the upstream case portion 3 is larger than the cross-sectional diameter of the downstream case portion 4, the upstream winding portion 33 may be disposed outside the downstream winding portion 43 so that at least a part of the upstream winding portion 33 faces the downstream winding portion 43 in the radial direction. Then, similarly to this embodiment, an absorbing portion 5 may be provided in the portions of the upstream and downstream winding portions 33, 43 that face each other.

[0042] On the other hand, when the cross-sectional diameters of the upstream and downstream case portions 3, 4 are approximately the same, the downstream winding portion 43 may be expanded (see FIG. 7). That is, the downstream case portion 4 may be provided with an expanded diameter portion 44 whose cross-sectional diameter expands toward the upstream side, and the downstream winding portion 43 may be provided adjacent to the upstream side of the expanded diameter portion 44. Then, similarly to this embodiment, the downstream winding portion 43 may be disposed outside the upstream winding portion 33, and at least a part of the downstream winding portion 43 may be made to face the upstream winding portion 33 in the radial direction, and an absorbing portion 5 may be provided between the upstream and downstream winding portions 33, 43.

[0043] Note that, even when the cross-sectional diameter of the upstream case portion 3 is larger than the cross-sectional diameter of the downstream case portion 4, the downstream case portion 4 may be provided with an expanded diameter portion 44 in a similar manner, and the downstream winding portion 43 may be provided adjacent to the upstream side of the expanded diameter portion 44 (see FIG. 8). Similarly, the downstream winding portion 43 may be disposed outside the upstream winding portion 33, and the absorbing portion 5 may be provided between the upstream and downstream winding portions 33, 43.

[0044] Similarly, when the cross-sectional diameters of the upstream and downstream case parts 3, 4 are approximately the same, or when the cross-sectional diameter of the downstream case part 4 is larger than the cross-sectional diameter of the upstream case part 3, the upstream winding part 33 may be expanded in diameter. Similarly, the upstream winding part 33 may be disposed outside the downstream winding part 43, and the absorbing part 5 may be provided between the upstream and downstream winding parts 33, 43.

[0045] Furthermore, when the cross-sectional diameters of the upstream and downstream case parts 3, 4 are approximately the same, the end of the upstream circulating part 33 and the end of the downstream circulating part 43 may be arranged to face each other in the exhaust gas flow direction with a predetermined gap therebetween (see FIG. 9). The end of the upstream circulating part 33 and the end of the downstream circulating part 43 may be connected by a cylindrical connecting part 50, and the absorbing part 5 may be provided in the connecting part 50 so as to surround the exhaust gas flow path and configured as a bellows that expands and contracts in the exhaust gas flow direction.

[0046] [6. Modifications of the sensor hole] In this embodiment, the downstream winding portion 43 is located outside the upstream winding portion 33, and the sensor hole 6 is formed in a region that extends across the portion of the downstream winding portion 43 that faces the upstream winding portion 33 and the absorbent portion 5. However, the sensor hole 6 may be formed in the portion of the downstream winding portion 43 that faces the upstream winding portion 33 (see FIG. 10), or may be formed in the absorbent portion 5 (see FIG. 11).

[0047] Of course, even in such a case, the sensor pipe 60 is provided in a state in which it is inserted into the sensor hole 6. Alternatively, the sensor pipe 60 may not be inserted into the sensor hole 6, and the end of the sensor pipe 60 may be provided in a state in which it is joined to the downstream winding section 43 and / or the absorbing section 5 (see FIG. 12).

[0048] On the other hand, when the upstream winding portion 33 is located outside the downstream winding portion 43, the sensor hole portion 6 may be formed in an area extending across the upstream winding portion 33 and the absorbent portion 5, or may be formed in the upstream winding portion 33 or the absorbent portion 5.

[0049] Furthermore, the position of the sensor hole 6 can be determined appropriately as long as it allows communication between the intermediate region 10 and the outside of the case portion 2. [7. Effects] (1) The purification device 1 of the above embodiment is provided downstream of the exhaust manifold, and since extremely high-temperature exhaust gas flows into the purification device 1, the case 2 is prone to thermal expansion. In addition, the flange-shaped upstream and downstream connection parts 20, 21 at both ends of the case 2 of the purification device 1 are fixed to components such as the exhaust manifold. Therefore, even if the case 2 expands thermally, the positions of the upstream and downstream connection parts 20, 21 hardly change, making it difficult to absorb thermal stress. Furthermore, the periphery of the upstream and downstream connection parts 20, 21 in the case 2 is narrowed, making it relatively fragile. Therefore, if the case 2 expands thermally, stress is concentrated in these parts, which may cause damage.

[0050] In response to this, the case part 2 is provided with an absorption part 5. This can absorb the thermal expansion of the case part 2 caused by high-temperature exhaust gas and the contraction of the case part 2 caused by cooling. This can mitigate the effects of thermal stress. This also improves the durability of the purification device 1, and allows the case part 2 to be made of a material with low strength or the plate thickness of the case part 2 to be reduced, thereby reducing the cost of the purification device 1.

[0051] (2) The absorbing section 5 is provided between the upstream and downstream circulating sections 33, 34 in the upstream and downstream case sections 3, 4, and has a curved shape so as to protrude along the axis A in a cross section including the axis A. Therefore, the absorbing section 5 bends, and can suitably absorb the thermal expansion and contraction in the upstream and downstream case sections 3, 4. This makes it possible to mitigate the effects of thermal stress.

[0052] (3) Furthermore, the absorbing section 5 is provided between the upstream and downstream case sections 3, 4. In particular, in the above embodiment, the cross-sectional diameter of the downstream case section 4 is larger than the cross-sectional diameter of the upstream case section 3, and the downstream case section 4 has higher rigidity than the upstream case section 3. For this reason, stress is likely to concentrate in the portion between the upstream and downstream case sections 3, 4, and this portion may become a weak portion that is prone to damage. In contrast, according to the above embodiment, the absorbing section 5 that alleviates the effects of thermal stress is provided between the upstream and downstream case sections 3, 4, and therefore damage to the weak portion can be suppressed. Therefore, the effects of thermal stress can be alleviated.

[0053] (4) Furthermore, the portions of the upstream and downstream winding portions 33, 43 that face each other may be weak parts, but the absorbing portion 5 that alleviates the effects of thermal stress is provided in these portions. Therefore, damage to the weak parts can be suppressed, and the effects of thermal stress can be alleviated.

[0054] (5) Furthermore, the sensor hole 6 is provided in a portion of the downstream winding portion 43 facing the upstream winding portion 33 and / or in the absorption portion 5. This makes it possible to mitigate collisions of the exhaust gas with the sensor hole 6, thereby making it possible to prevent a decrease in the measurement accuracy of the exhaust gas pressure by the pressure sensor 61 due to the influence of the exhaust gas flow. This makes it possible to accurately detect the degree of clogging of the downstream purification member 40 and to prevent excessive regeneration processing of the downstream purification member 40.

[0055] 8. Other Embodiments (1) In the above embodiment, the upstream purification member 30 is configured as a catalyst, and the downstream purification member 40 is configured as a filter. However, this is not limited to this, and the upstream and downstream purification members 30, 40 can be configured as various members for purifying exhaust gas. In addition, in the above embodiment, two purification members are arranged in the case part 2, but one or three or more exhaust gas purification members may be arranged in the case part 2. In addition, in the above embodiment, the upstream and downstream case parts 3, 4 are provided, but three or more case parts configured in the same manner may be provided. And, an absorption part 5 may be provided at the point where the two case parts are connected, in the same manner as in the above embodiment.

[0056] (2) In the above embodiment, the purification device 1 is connected to the outlet of the exhaust manifold. However, this is not limiting, and for example, an absorption section having a similar configuration to the above embodiment may be provided in an exhaust gas purification device connected to other members forming a flow path of exhaust gas of a vehicle (for example, a pipe or an exhaust gas outlet of an internal combustion engine of a vehicle).

[0057] (3) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0058] [9. Correspondence of Words] One of the upstream connection portion 20 and the downstream connection portion 21 corresponds to an example of a first connection portion, and the other corresponds to an example of a second connection portion. One of the upstream and downstream case portions 3, 4 corresponds to an example of a first case portion, and the other corresponds to an example of a second case portion. One of the upstream and downstream purification members 30, 40 corresponds to an example of a first purification member, and the other corresponds to an example of a second purification member. One of the upstream opening 32 and the downstream opening 42 corresponds to an example of a first opening, and the other corresponds to an example of a second opening. One of the upstream and downstream winding portions 33, 43 corresponds to an example of a first winding portion, and the other corresponds to an example of a second winding portion. [Explanation of symbols]

[0059] A...axis, 1...purification device, 10...intermediate region, 2...case portion, 20...upstream connection portion, 21...downstream connection portion, 3...upstream case portion, 30...upstream purification member, 32...upstream opening, 33...upstream circulating portion, 4...downstream case portion, 40...downstream purification member, 42...downstream opening, 43...downstream circulating portion, 5...absorption portion, 6...sensor hole portion, 60...sensor pipe, 61...pressure sensor.

Claims

1. A purification device mounted on a vehicle and configured to purify exhaust gas from the vehicle, a case portion which is a cylindrical portion having an exhaust gas flow path therein and which accommodates at least one purification member configured to purify the exhaust gas; First and second connection parts are provided at both ends of the case part and are configured to be connected to other members that form an exhaust gas flow path of the vehicle; an absorption section provided in the case section adjacent to a flow path of the exhaust gas inside the case section and circling the flow path; The absorption section is configured to absorb expansion and contraction of the case section along a flow direction of the exhaust gas, The case portion includes first and second case portions which are cylindrical portions arranged side by side in a flow direction of exhaust gas, the first and second case portions accommodate first and second purification members, respectively, which are the purification members; The first case portion is a first opening located at an end; a first circumferential portion that circumferentially surrounds the first opening, The second case portion is a second opening located at the end; a second circumferential portion that circumferentially surrounds the second opening, the first opening of the first case portion is connected to the second opening of the second case portion, The absorbing portion is provided between the first winding portion and the second winding portion. Purification equipment.

2. The purification device according to claim 1, the second winding portion is disposed outside the first winding portion, and at least a portion of the second winding portion faces the first winding portion; The absorbing portion is provided in portions of the first winding portion and the second winding portion that face each other. Purification equipment.

3. The purification device according to claim 2, a sensor hole portion communicating between an outside of the case portion and a space between the first and second purification members is provided in a portion of the second winding portion facing the first winding portion and / or in the absorption portion, The sensor hole is connected to a sensor pipe in which a sensor for measuring the pressure of exhaust gas is provided. configured to be Purification equipment.

4. The purification device according to any one of claims 1 to 3, The case portion has first and second winding portions that wind around an exhaust gas flow path inside the case portion, the second winding portion is disposed outside the first winding portion, The absorption portion is a portion provided between the first winding portion and the second winding portion, and has a curved shape so as to protrude to the upstream side or the downstream side in the flow direction of the exhaust gas in a cross section including an axis passing through the center of the exhaust gas flow path inside the case portion. Purification equipment.

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